Plutonium found outside Fukushima plant…(Plutonium-240 has a half-life of 6563 years. Plutonium-239 has a half-life of 24,100 years.)
Minute amounts of plutonium have been detected for the first time in soil outside the Fukushima Daiichi nuclear plant.
Shinzo Kimura of Hokkaido University collected the roadside samples in Okumamachi, some 1.7 kilometers west of the front gate of the power station. They were taken during filming by NHK on April 21st, one day before the area was designated as an exclusion zone.
Professor Masayoshi Yamamoto and researchers at a Kanazawa University laboratory analyzed the samples and found minute amounts of 3 kinds of plutonium.
The samples of plutonium-239 and 240 make up a total of 0.078 becquerels per kilogram.
This is close to the amount produced by past atomic bomb tests.